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<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2017 Open Source Matters, Inc.
<https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see
LICENSE.txt
 */

namespace Joomla\CMS\Authentication\Password;

use Joomla\Authentication\Password\HandlerInterface;
use Joomla\CMS\Crypt\Crypt;
use Joomla\CMS\User\UserHelper;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Password handler for MD5 hashed passwords
 *
 * @since       4.0.0
 *
 * @deprecated  4.0 will be removed in 6.0
 *              Support for MD5 hashed passwords will be removed without
replacement
 */
class MD5Handler implements HandlerInterface,
CheckIfRehashNeededHandlerInterface
{
    /**
     * Check if the password requires rehashing
     *
     * @param   string  $hash  The password hash to check
     *
     * @return  boolean
     *
     * @since   4.0.0
     */
    public function checkIfRehashNeeded(string $hash): bool
    {
        return true;
    }

    /**
     * Generate a hash for a plaintext password
     *
     * @param   string  $plaintext  The plaintext password to validate
     * @param   array   $options    Options for the hashing operation
     *
     * @return  string
     *
     * @since   4.0.0
     */
    public function hashPassword($plaintext, array $options = [])
    {
        $salt    = UserHelper::genRandomPassword(32);
        $crypted = md5($plaintext . $salt);

        return $crypted . ':' . $salt;
    }

    /**
     * Check that the password handler is supported in this environment
     *
     * @return  boolean
     *
     * @since   4.0.0
     */
    public static function isSupported()
    {
        return true;
    }

    /**
     * Validate a password
     *
     * @param   string  $plaintext  The plain text password to validate
     * @param   string  $hashed     The password hash to validate against
     *
     * @return  boolean
     *
     * @since   4.0.0
     */
    public function validatePassword($plaintext, $hashed)
    {
        // Check the password
        $parts = explode(':', $hashed);
        $salt  = @$parts[1];

        // Compile the hash to compare
        // If the salt is empty AND there is a ':' in the
original hash, we must append ':' at the end
        $testcrypt = md5($plaintext . $salt) . ($salt ? ':' .
$salt : (strpos($hashed, ':') !== false ? ':' :
''));

        return Crypt::timingSafeCompare($hashed, $testcrypt);
    }
}